What Is an IPO? How Initial Public Offerings Work and Should You Invest?

IPOs make headlines: a famous company goes public, its stock jumps on day one, and early investors become rich overnight. It’s easy to see why many people want in. But the reality of IPO investing is more nuanced, and understanding how the process works can help you avoid expensive mistakes.

What is an IPO?

An initial public offering (IPO) is the first time a private company sells shares to the public and lists on a stock exchange such as the NYSE or Nasdaq. After the IPO, anyone can buy and sell the company’s shares on the open market.

Money raised in an IPO can come from:

• Primary shares: New shares created by the company — the proceeds go to the company to fund growth or pay down debt.
• Secondary shares: Existing shares sold by founders, employees or early investors — the proceeds go to those sellers, not the company.

The mix matters. A large secondary component means insiders are cashing out.

Why companies go public

• Raise capital for expansion, research or acquisitions
• Give early investors and employees a way to sell shares
• Increase visibility and credibility
• Gain access to public markets for future fundraising
• Use publicly traded stock for acquisitions and employee compensation

How the IPO process works

1. Hire underwriters. Investment banks manage the offering and help set the price.
2. File with regulators. In the US, the company files an S-1 registration statement with the SEC, including the prospectus.
3. Roadshow. Management pitches the company to institutional investors.
4. Pricing. Based on demand, the underwriters and company set the IPO price, usually the night before trading starts.
5. Allocation. Shares are allocated, mostly to institutional investors.
6. First day of trading. The stock opens on the exchange, often at a price different from the IPO price.

Alternatives to a traditional IPO

• Direct listing: Existing shares start trading without new shares or underwriters setting a price.
• SPAC merger: A private company merges with a publicly listed “blank check” company. SPACs drew criticism after many performed poorly.

Can you buy IPO shares?

Most IPO allocations go to large institutions. Some brokerages offer IPO access to retail customers, often with eligibility requirements and limited share counts. If you don’t get an allocation, you can buy once the stock starts trading — but by then the price may already be well above the IPO price.

The first-day “pop” — and what happens later

IPOs are often priced to leave some upside, so first-day gains are common. But the long-run picture is less rosy: research by University of Florida professor Jay Ritter and others has found that, on average, IPOs have underperformed comparable established companies over the three to five years after going public. Buying a hot IPO after a big first-day jump has historically been a risky strategy.

Key risks of IPO investing

1. Valuation risk: Hype can push prices far above fundamentals.
2. Limited track record: Little public history makes the business harder to evaluate.
3. Lock-up expiration: When insiders can sell (often 90–180 days later), share prices may come under pressure.
4. Volatility: New stocks can swing wildly as the market discovers a fair price.
5. Information gap: Insiders and underwriters know far more than retail investors.
6. Dual-class structures: Founders may keep voting control even with a minority of shares.

How to evaluate an IPO

Read the prospectus (S-1). Focus on:

• The business model: How does the company make money? Who are its competitors?
• Financials: Revenue growth, margins, profitability, cash burn and debt.
• Use of proceeds: Growth investment, or insiders selling out?
• Valuation: Compare price-to-sales or price-to-earnings with established peers.
• Risk factors: The company’s own list of what could go wrong.
• Ownership and governance: Voting rights, lock-up terms and management incentives.

Questions to ask yourself

• Would I buy this company if it had been public for years?
• Is the price justified by fundamentals, or by hype?
• Am I prepared to hold through big price swings?
• Does it fit my overall portfolio and risk level?

A sensible approach

For most long-term investors, IPOs should be a small part of a diversified portfolio, if any. Many choose to wait until a newly public company reports several quarters of results and the lock-up expires before deciding. Broad index funds will add successful newly listed companies over time anyway, once they qualify for the index.

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Conclusion

An IPO is a company’s debut on the public markets — an exciting event, but not an automatic opportunity. Understand who’s selling, how the stock is priced and what risks the company faces. Read the prospectus, be skeptical of hype, keep any IPO positions small, and remember that patience often pays more than being first.